#include <bits/stdc++.h>
using namespace std;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int h, w;
    cin >> h >> w;
    int a, b;
    cin >> a >> b;
    int r1, c1, r2, c2;
    cin >> r1 >> c1 >> r2 >> c2;
    int p, q;
    cin >> p >> q;
    int ans = 1e9;
    for (int i = r1; i <= r2; i++) {
        for (int j = c1; j <= c2; j++) {
            ans = min(ans, abs(a - i) + abs(b - j) + abs(i - p) + abs(j - q) + abs(p - a) + abs(q - b));
        }
    }
    cout << ans << '\n';
    return 0;
}